Method and system for dynamic play list modification

摘要

Asynchronous message delivery to a media player is defined wherein the message provides instructions to change the SMIL (or XML) based play list dynamically at runtime without creation or provision of any entirely new play list. This play list modification does not result in a visible, distracting transition as would normally occur during an instruction to reload the SMIL play list. Changes to the media presentation occur without the visually disruptive page reload.

主权项

1. A method for providing a dynamic modification of at least a portion of a presentation, said presentation comprising a play list including a plurality of play sheet elements and a sequencing timeline for playback of said play list, at least one play sheet element being selected from a group consisting of at least one of an image element, a video element, and an audio element, the method comprising:
storing the play sheet elements and parsing extended machine language of the play sheet elements into a document object model data structure; in response to an asynchronously received control message, identifying a location in the presentation that requires a change, and identifying a respective play sheet element that requires said change, said change including at least one operation selected from the group of operations consisting of deletion, insertion, and replacement; and making said change to a respective document object of the identified play sheet element changing a portion of the presentation in accordance with the at least one operation at the identified location during playback of the playlist such that a current moment of playback precedes a moment that the change takes effect at a scheduled presentation time of the identified location in the presentation, said change taking effect without requiring a reloading of the play sheet elements or generating new play sheet elements.